No known security advisories.
The current version has no OSV.dev malware reports and no critical or high-severity vulnerabilities.
isal has 2.3M monthly downloads and 56 GitHub stars. Version 1.8.0 supports Python 3.9+, first published in 2020.
It is minimally maintained under a permissive license, last released in Sep 2025.
It is used by 26 tracked packages, including asammdf, xopen and oarepo.
GitHub topics include deflate, gzip and zlib.
Package Insights
Package Risks
- Moderate bus factor: only 7 contributor(s) for this download volume
Score breakdown - each component scores 0-100, weighted by percentage
Maintenance
50
Popularity
34
Adoption
90
Community
30
Provenance
0
How the maintenance status was determined
Last commit
299 days ago
Monthly downloads
2,254,873
Active
Activity within 30 days
Stable
Activity within 31-180 days
•
Minimal
Activity within 181-365 days, or no activity data
At Risk
No activity for > 365 days, but > 10,000 monthly downloads
Archived
Repository flagged as archived on GitHub
How the popularity category was determined
Monthly downloads
2,254,873
Stars
56
Stars per 1k downloads
0.02
Industry Standard
> 10,000,000 monthly downloads
•
Hidden Gem
< 0.5 stars per 1k downloads and > 100,000 monthly downloads
Community Favorite
> 5 stars per 1k downloads
Rising Star
Balanced ratio of stars to downloads
Unknown
Fewer than 1,000 monthly downloads, or no star data
How download momentum is calculated
Week daily avg
86,253
Month daily avg
75,162
Momentum
+14.8%
((week_daily_avg - month_daily_avg) / month_daily_avg) * 100Python version support tiers
requires_python
>=3.9
Cutting Edge
Minimum supported version is 3.12 or newer
•
Modern
Minimum supported version is 3.9, 3.10, or 3.11
Legacy
Supports 3.8 or older (or Python 2)
Unknown
No requires_python specified or unparseable
License categories
License
PSF-2.0
•
Permissive
MIT, Apache, BSD, ISC, Unlicense, CC0, etc.
Copyleft
GPL, LGPL, AGPL, MPL, EPL, etc.
Proprietary
Commercial, all rights reserved, custom EULAs
Unknown
No license specified, or none of the above match
How the release cadence was determined
Last release
299 days ago
Total releases
32
Releases/year
5.7
Rapid
Last release within 365 days and > 12 releases/year
•
Regular
Last release within 365 days
Slow
Last release 366-730 days ago
Stalled
Last release > 730 days ago, or no releases
Unknown
No usable release date available
How contributor risk was determined
Contributors
7
Monthly downloads
2,254,873
High Load
≤ 2 contributors and ≥ 50,000 monthly downloads
•
Moderate Load
< 10 contributors and ≥ 500,000 monthly downloads
Low Load
< 25 contributors and ≥ 5,000,000 monthly downloads, or sole maintainer with ≥ 10,000 monthly downloads
Balanced
Enough contributors for the package's popularity
Unknown
No contributor data available
Engagement
45
Issue Burden
-
per 1k stars
Discussions
-
per 1k stars
Fork Ratio
70.0%
contrib / forks
Stale Release
No
PR Velocity
Quiet
Weekly Downloads
GitHub Stars
Not all downloads include detailed metadata. Breakdowns reflect the subset that does.
Downloads by OS
Linux
45.6K
Windows
486
macOS
417
Python Versions
3.10
53.4%
24.6K
3.12
19.2%
8.8K
3.11
18.9%
8.7K
3.14
4.5%
2.1K
3.13
4.1%
1.9K
Top Countries
1.
US
16.8K
US
2.
DE
14.7K
DE
3.
NL
7.1K
NL
4.
GB
5.0K
GB
5.
IE
648
IE
6.
JP
326
JP
7.
ES
294
ES
8.
SG
272
SG
9.
HK
188
HK
10.
AU
168
AU
Dependencies
0
No dependencies
Package Information
License
PSF-2.0
First Release
November 11, 2020
Last Release
10 months ago
Last Commit
10 months ago
Latest Version
1.8.0
Total Releases
32
Contributors
7
Open PRs
3
Archived
No
Author
Leiden University Medical Center
Python Versions
3
3.10
3.11
3.12
3.13
3.14
Wheels
cp310
cp311
cp312
cp313
cp314
cp36
cp37
cp38
cp39
Tracking Since
January 6, 2026
Data Updated
July 5, 2026
Data Freshness
Fresh